We found (by accident) that if a command that generates an error (in this case a create index that had too long of a name) is shipped to a replica, the replica dies a horrible death.

Tue Nov 20 07:48:50 [repl writer worker 2] build index gshiftlabs.blekko_backlink_daily_metrics

{ presence_id: 1, web_site_id: 1, competitor_id: 1, web_page_id: 1, external_page_id: 1, recorded_on: 1 }

background
Tue Nov 20 07:48:51 [repl writer worker 2] ERROR: exception: ns name too long, max size is 128 on: { ts: Timestamp 1353357103000|4, h: 4767433707090496134, v: 2, op: "i", ns: "gshiftlabs.system.indexes", o: { unique: true, background: tru
e, dropDups: true, ns: "gshiftlabs.blekko_backlink_daily_metrics", key:

{ presence_id: 1, web_site_id: 1, competitor_id: 1, web_page_id: 1, external_page_id: 1, recorded_on: 1 }

, name: "presence_id_1_web_site_id_1_competitor_id_1_web_page
_id_1_external_page_id_1_recorded_on_1" } }
Tue Nov 20 07:48:51 [repl writer worker 2] Fatal Assertion 16361
0xaf8c41 0xabe223 0x99c807 0xacc4cd 0xb3ec79 0x7fabe36d6e9a 0x7fabe29ec4bd
/usr/bin/mongod(_ZN5mongo15printStackTraceERSo+0x21) [0xaf8c41]
/usr/bin/mongod(_ZN5mongo13fassertFailedEi+0xa3) [0xabe223]
/usr/bin/mongod(_ZN5mongo7replset21multiInitialSyncApplyERKSt6vectorINS_7BSONObjESaIS2_EEPNS0_8SyncTailE+0x197) [0x99c807]
/usr/bin/mongod(_ZN5mongo10threadpool6Worker4loopEv+0x26d) [0xacc4cd]
/usr/bin/mongod() [0xb3ec79]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x7e9a) [0x7fabe36d6e9a]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d) [0x7fabe29ec4bd]
Tue Nov 20 07:48:51 [repl writer worker 2]

***aborting after fassert() failure

Tue Nov 20 07:48:51 Got signal: 6 (Aborted).

Tue Nov 20 07:48:51 Backtrace:
0xaf8c41 0x5586c9 0x7fabe29304c0 0x7fabe2930445 0x7fabe2933bab 0xabe25e 0x99c807 0xacc4cd 0xb3ec79 0x7fabe36d6e9a 0x7fabe29ec4bd
/usr/bin/mongod(_ZN5mongo15printStackTraceERSo+0x21) [0xaf8c41]
/usr/bin/mongod(_ZN5mongo10abruptQuitEi+0x399) [0x5586c9]
/lib/x86_64-linux-gnu/libc.so.6(+0x364c0) [0x7fabe29304c0]
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0x35) [0x7fabe2930445]
/lib/x86_64-linux-gnu/libc.so.6(abort+0x17b) [0x7fabe2933bab]
/usr/bin/mongod(_ZN5mongo13fassertFailedEi+0xde) [0xabe25e]
/usr/bin/mongod(_ZN5mongo7replset21multiInitialSyncApplyERKSt6vectorINS_7BSONObjESaIS2_EEPNS0_8SyncTailE+0x197) [0x99c807]
/usr/bin/mongod(_ZN5mongo10threadpool6Worker4loopEv+0x26d) [0xacc4cd]
/usr/bin/mongod() [0xb3ec79]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x7e9a) [0x7fabe36d6e9a]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d) [0x7fabe29ec4bd]

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